facial nerve palsy | 7th cranial nerve | upper motor neuron lesion скачать в хорошем качестве

facial nerve palsy | 7th cranial nerve | upper motor neuron lesion

#demo on a #patient ; #facial #examination #learn #abnormal #medschool #neurology #cranialnerves #facialnerve #facialpalsy #brain #medicalstudents #cornea #corneal-reflexes #reflexes #reflexão #neurologia Facial nerve palsy : The facial, or seventh, cranial nerve (CN VII) is a predominantly motor nerve that innervates the muscles of facial expression. It carries parasympathetic secretory fibers to the submandibular and sublingual salivary glands, the lacrimal gland and to the mucous membranes of the oral and nasal cavities. It has some sensory functions; carry taste sensations from the anterior two-thirds of the tongue. Examination of the Motor Functions: It assess the actions of the muscles of facial expression. At rest the face is generally symmetric, at least in young individuals. Observe the nasolabial folds for depth and symmetry and note whether there is any asymmetry in forehead wrinkling or in the width of the palpebral fissures with the face at rest. A flattened nasolabial fold with symmetric forehead wrinkles suggests a central (upper motor neuron) facial palsy. A flattened nasolabial fold with smoothing of the forehead wrinkles on the same side suggests a peripheral (lower motor neuron) facial nerve palsy. A unilaterally widened palpebral fissure suggests a facial nerve lesion causing loss of tone in the orbicularis oculi muscle, the eye closing sphincter; this is sometimes confused with ptosis of the opposite eye. It is a common misconception that facial nerve palsy causes ptosis. Observe the movements during spontaneous facial expression as the patient talks, smiles, or frowns. Certain upper motor neuron facial palsies are more apparent during spontaneous smiling than when the patient is asked to smile or show the teeth. How completely the patient buries the eyelashes on the two sides is a sensitive indicator of orbicularis oculi strength. If the examiner can force the eye open with her small fi ngers, then the orbicularis oculi is definitely weak. When the orbicularis oris sphincter is impaired, the examiner may be able to force air out of the puffed cheek through the weakened lips. Examination of the Reflexes : The corneal and other reflexes mediated largely by CN V & CN 7th. Frontal release signs such as the snout, suck, and palmomental are also mediated by facial nerve. Examination of the Sensory Functions : Testing of CN VII sensory functions is limited to taste. Examination of the Secretory Functions The secretory functions of CN VII can usually be evaluated by history and observation. Decreased tearing may be determined from the history. Tear production may be quantitated with the Schirmer test. 🎵 Song: 'Sappheiros - Embrace' is under a creative commons license license. https://www.youtube.com/channel/UCxLK... 🎶 Music promoted by BreakingCopyright:    • 🍀 Chill Instrumental [Non Copyrighted Musi...